Spring



FIG. 1 is a front and right side perspective view of a plastic spring, showing my new design in use in a dispenser bottle;

FIG. 2 is a right side view thereof

FIG. 3 is a front and right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a front and left side view thereof;

FIG. 6 is a top, front, and right side view of a spring with the dispenser bottle portion removed for clarity of disclosure;

FIG. 7 is a front view thereof with the rear view being identical;

FIG. 8 is a front and right side view thereof;

FIG. 9 is a right side view thereof, with the left side view being identical;

FIG. 10 is a front and left side view thereof;

FIG. 11 is a top view thereof; and,

FIG. 12 is a bottom view thereof.

The features shown in broken lines depict environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a spring, as shown and described. 